A small gap that can form between the casing or liner and the surrounding cement sheath, most commonly formed by variations in temperature or pressure during or after the cementing process.
在套管或衬管与周围的水泥环之间所形成的小间隙，这些间隙是由于在固井期间或固井之后温度或压力的变化所致。
Double tidal sheath structure, improve the cable-side pressure, impact resistance.
双护套结构挡潮，提高了光缆抗侧压、抗冲击性能。
Finally, the conclusion is that the pulse pressure caused by vibrated water injection can not damage to casing pipe, cement sheath and formation.
最后得出结论——振动注水所产生的脉动压力不会对套管、水泥环及地层造成损坏。
Finally, the conclusion is that the pulse pressure caused by vibrated water injection can not damage to casing pipe, cement sheath and formation.
最后得出结论——振动注水所产生的脉动压力不会对套管、水泥环及地层造成损坏。
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